As you can see, it's already reached it's goal! I don't know if they'll have stretch goals for it or whatever, but regardless, Bounty Battle is a fighting game inspired by the likes of Super Smash Bros. and Soul Calibur, who's main hook, so to speak, is that heroes and protagonists from other indie games. Among said heroes are:

And possibly more that probably haven't been officially announced yet.

Now if you haven't guessed from the title, the fact that Playtonic Games is technically an indie developer and Yooka-Laylee is technically an indie game means they would qualify for this kind of thing, but then again, I've seen a lot of people's resentment for crossover cameos, both in Yooka-Laylee and even outside of Playtonic's games. Personally speaking, I would love to see them in a game like this! I always liked the idea of a indie fighting game crossover, and this seems like as good an opportunity as ever to have Yookay & Laylee get in on this! ...If Playtonic is willing to do it, that is.

Incidentally, if you're interested in this game or want to contact the developers, you can do so at these places...